Pregnancy symptoms and questions

Patient :This girl that I met had intercourse and I have a strong reason to believe that she is trying to make me take responsibility of her being pregnant when I believe that another man (her boyfriend) is. I wasn't aware she had a boyfriend and I believe this was a ploy to frame me for the pregnancy to take away the blame from the boyfriend. The question that I have is that this girl and I had intercourse roughly less than 5 days ago and she claims that she is pregnant. Is it possible to show symptoms or to know that she is pregnant in that short time frame? When I asked to clarify she wasn't responsive and I am still waiting for a response. Another thing was that the day we had intercourse and the day after (when I drove her to the pharmacy to purchase Plan B) she exhibited an extreme soreness of the breasts which was very suspicious to me. I would greatly appreciate a response. Thanks in advance.

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